Arabidopsis ABI5 subfamily members have distinct DNA-binding and transcriptional activities. Academic Article uri icon


  • A small family of novel basic leucine zipper proteins that includes abscisic acid (ABA)-INSENSITIVE 5 (ABI5) binds to the promoter region of the lea class gene Dc3. The factors, referred to as AtDPBFs (Arabidopsis Dc3 promoter-binding factors), were isolated from an immature seed cDNA library. AtDPBFs bind to the embryo specification and ABA-responsive elements in the Dc3 promoter and are unique in that they can interact with cis-elements that do not contain the ACGT core sequence required for the binding of most other plant basic leucine zipper proteins. Analysis of full-length cDNAs showed that at least five different Dc3 promoter-binding factors are present in Arabidopsis seeds; one of these, AtDPBF-1, is identical to ABI5. As expected, AtDPBF-1/ABI5 mRNA is inducible by exogenous ABA in seedlings. Despite the near identity in their basic domains, AtDPBFs are distinct in their DNA-binding, dimerization, and transcriptional activity.

published proceedings

  • Plant Physiol

altmetric score

  • 3

author list (cited authors)

  • Kim, S. Y., Ma, J., Perret, P., Li, Z., & Thomas, T. L.

citation count

  • 114

complete list of authors

  • Kim, Soo Young||Ma, Jianzhong||Perret, Philippe||Li, Zhongsen||Thomas, Terry L

publication date

  • October 2002